Diarylation of N- and O-nucleophiles through a metal-free cascade reaction

16 July 2021, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The arylation of heteroatom nucleophiles is a central strategy to reach diarylated compounds that are key building blocks in agrochemicals, materials and pharmaceuticals. Nucleophilic aromatic substitution is a classical tool for such arylations, and hypervalent iodine-mediated arylations are modern alternatives to achieve a wider scope of products. Herein, we combine the benefits of those strategies to enable an atom-efficient and transition metal-free functionalization of N- and O- nucleophiles with two structurally different aryl groups, to provide di- and triarylamines and diaryl ethers in one single step (> 100 examples). The core of this strategy is the unique reactivity discovered with certain fluorinated diaryliodonium salts, which unveils novel reaction pathways in hypervalent iodine chemistry. The method is suitable for aliphatic amines, anilines, ammonia and even water and tolerates a wide variety of functional and protecting groups. Furthermore, the retained iodine substituent is easily accessible for derivatization of the products.

Keywords

hypervalent iodine chemistry
diaryliodonium salts
nucleophilic aromatic substitution
arylation
diaryl ethers
triarylamines

Supplementary materials

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Supporting information
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Detailed optimizations, experimental procedures, analytical data and NMR spectra.
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